buchner



PAPER MAKING MACHINE Filed Jan. 17. 1929 z Sheet-Sheet 1 Eme ine?" Fig.2

Sept- 1 c. BUCH NER 1,876,563

' PAPER MAKING MACHINE Y Filed Jan. 17. 1929 2 Sheets-Sheet 2 Ufiegulailhy 4 3656M Ca Patented Sept. 13, 1932 UNITED STATES PATENT,OFFICE cam. nfionnnn, or MANHEIM-WALDHOF, GERMANY, ASSIGNOR 'rornrxausA. G.

or'MANNHEIm-waLDHoI, GERMANY PAPER MAKING MACHINE Application filedJanuary 17, 1929, Serial No. 833,091, and in Germany February 14, 1928.

As is Well known, it is of great importance to keep under observationand to regulate the degree of fineness to which the pulp fed to papermaking machines is ground.

According to the present invention this degree of grinding can beobserved continuously at the paper making machine directly and may beautomatically regulated.

The invention consists in this, that a greater or less portion of theWater which runs down through the sieve of the paper making machine iscontinuously measured and that any fluctuations in the quantities areutilized for initiating regulating operations.

Usually the water running down through the sieve is caught in aplurality of troughs lying one beyond the other and isconveyed away tothe side to be used again. When a uniform quantity of water flows to thesieve per unit of time, the degree of grinding of the pulp howevervarying, both the total quantity of the water flowing down and the partquantities apportioned to the separate troughsalters. The greatestfluctuations occur mostly in the first trough immediately behind thebreast roll. The coarser the pulp, in other'words the less the degree ofcommmution, the more water will escape at this point.

In the next sieve sections there will also be fluctuations in thequantity, but these will also be influenced by the fact that the firstsieve section has already let through more water, so that less waterremains to be passed on.

The new method consists in measuring continuously the quantity of waterwhich flows down on the whole sieve or at one part of the sievefound tobe particularly suitable for the purpose by means of any known device.This may, for instance, be effected by providing at the outflow of theparticular water trough a measuring'box having a constant outflow.opening, a so-called danaide, the "water level-of which is observed bymeans of a float and a pointer.

In the case, for example, of the first trough behind the breast roll thefloat will stand higher with coarse pulp arid lower with smeary pulp, sothat the machine attendant can immediately see which way the downwardlyflowing pulp deviates from the desired medium degree of grinding. It isthen easy to take the necessary steps for making a uniform paper. Incases in which, owing to the provision of a conical pulp grinding mill,it is possible rapidly to influence the degree of grinding, according tothe invention a further step can be taken and the quantityof waterpassing through the sieve may be utilized for automatically regulatingthe degree of grinding. This may for instance be efi'ected by providingelectric limiting contacts on the float of the measuring box, thecontact of which causes an electric regulating motor to adjust thespindle of the conical, pulp mill so as to be tighter or looser. Me?chanical or hydraulic servo motors or the like may of course also beused, or the grinding apparatus may be influenped indirectly.

In the accompanying drawings a constructional example of the inventionis shown. 7 Fig. 1 shows a part rear end view of a paper making machineof the Fourdrinier type showing the measuring box according to theinvention in section. Fig. 2 is a part plan view of the arrangementshown in Fig. 1. Fig. 3 shows in elevation a portion of the rear end ofthe paper making machine, partly in section.

Referring to the drawings, 9 is the breast roll, over which passes thesieve wire i, h are the deckle str'aps'"which rest on the edges of thesieve wire and Z the table rolls of the ma chine. The pulp is fed to thebreast roll from apulp or stock box (not'shown) and the water whichflows from the pulp through the sieve i, which is supported by and movedby the breast roll'g and the table roll 2', passes between the rolls iinto the sieve water troughs f. The water in the sieve water troughs fflows into ameasuring trough a -in which is a float b. This measuringbox is preferably arranged below the first sieve water trough 7 directlyfollowing the breast roll g, but it can be arranged at any othersuitable point along the sieve i suitable for the removal of the sievewater.

i The diiferences in level of the water in the ,measuring box acorresponding to variations in the delivery of the sieve water theretoare measured by a liquid level indicating device of any suitable kind m.In Figure 1, the indicating device m is shown conventionally as apointer fixed to a pulley over which passes a flexible member attachedto the float, the movements of the latter causing the pointer to moveover a graduated scale. In the mens- 'uring box a baflles c and d areprovided, the object of which is to calm the sieve water, in order thatthe float b Will not be caused to swing to and fro. By adjusting thecrosssectional area at the outflow e in the bottom of the box, the sievewater in the box is kept at a definite level. Means are also providedfor connecting the float b to means for regulating the action of aconical pulp mill, for influencing the latter as required b the qualityof the paper pulp to be produce In Figure 1, a regulating device isshown comprising a switch n having a plurality of contacts which are forinstance connected up to the circuit of a regulating motor whichcontrols the grinding pressure of a conical pulp mill by varying thesetting of the conical rollers with respect to the roller casing.Should, for instance, during a working operation too much sieve waterenter the troughs f or the box a, that is should the pulp be too littleor too coarsely ground, the float b will rise and will influence theconical mill and consequently the degree of grinding of the pulp in sucha manner that the normal quantity ing machines having asieve, consistinin.

utilizin the flow of at least a portion 0 the water owing down throughthe sieve and varying in quantity according to the degree of grinding ofthe paper machine for indicating the degree of fineness of the grinding.

4. A method of checking the degree of grinding of the pulp supplied topaper making machines having a sieve, consisting in utilizing the flowof at least a portion of the water flowing down through the s.eve andvarying in quantity according to the degree of grinding of the papermachine for indicating and regulating the degree of fineness of name tothis specification.

CARL BUGHNER.

of sieve water will again pass into the sieve water trough f or the boxa. When there is a smaller outflow of sieve water, the float b willactuate the conical pulp mill in the opposite sense.

What I claim is:

1. A method of checking and regulating the degree of grinding of thepulp supplied to paper making machines having a sieve, consisting inmeasuring the quantity of flow of at least a portion of the waterflowing down through the sieve of the paper making machine, observingfluctuations in the said a quantity of flow and adjusting the grindingof the pulp to restore the quantity of flow to ghe Eormal valu as andfor the purpose set ort 1 2. The combination with a paper making machinehaving a sieve for separating the,

water from the pulp, means for leading away the water flowing downthrough the sieve and the Wat r flowing away from the sieve and actuatinmeans connected to said indicating means for operating the means forregulating the degree of grinding, as and for the purposes set forth.

3. A method of checking the degree of grinding of the pulp supplied topaper mak- CERTIFICATE OF CORRECTION. Patent No. 1,876,563. I summers,1932... um. uiion'm zn,

It is hereby certified that to "Papyrus A. G. as assignee of theentireinterestineaidinyention, whereas said patent should have been i ssued tothe inventor paid "Buckner-"1nd the "Papyrus A. G." as assignee of oneassignments in this office; and'that the said Letters Patentshould'be-read with this correction therein that the same may conform tothe record of the case in the Patent Office. V Signed and sealed this24th day of January, A. D. l933.

- M. J. Moore, (Seat) Acting Contaminant-Patents;

the above numbered-patent wee erroneously issued- -half interest only isshownby the reeofllafll

